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A technology for tube furnaces and shaft furnaces, applied in shaft furnaces, furnaces, furnace types, etc., can solve the problem of coke consumption of secondary energy, achieve low cost, low equipment failure rate, and stable production and operation
Inactive Publication Date: 2009-05-27
郭瑛
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But still need to consume secondary energy coke
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[0037] The embodiments of the present invention are further described, and the embodiments are used to illustrate the present invention, but not to make any inventions.
[0038] 1. Iron ore powder, coal powder, and lime powder are mixed according to a certain proportion, among which: coal powder should exceed 10% to 20% of the amount required for reducing iron, so as to maintain a reducing atmosphere in the shaft furnace, and lime powder is mixed into one for To increase the plasticity of the mixture, the second is desulfurization. The amount of lime to be mixed should be determined according to the sulfur content of iron ore powder and coal powder, the content of gangue in iron ore powder, silicon dioxide in coal ash, and effective calcium oxide in lime powder. Wherein available calcium oxide: total silicon dioxide=1~3.
[0039] 2. Add water to the above three materials and stir them thoroughly. The amount of water added depends on the plasticity requirements. Generally, the ...
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Abstract
The invention relates to a coal-based melting reduction ironmaking method, in particular to a duplex coal-based melting reduction ironmaking method for tube furnaces, namely shaft furnaces, which solves problems existing in various melting reduction ironmaking methods in the prior art. The method comprises the process steps of proportioning iron ore powder, coal dust and lime powder, adding water, stirring the materials, briquetting and molding under high pressure, preheating, drying, reinforcing, pre-reducing in a tube furnace, performing melting and final reduction in a shaft furnace and separating slag and iron in a forehearth. The method has the advantages of little comprehensive investment, low comprehensive energy consumption, little pollution, low equipment failure rate, steady production operation, changeable production scale, easy co-production casting, low cost, high investment return, short process, easy operation, little equipment and easy maintenance.
Description
technical field [0001] The invention relates to a coal-based smelting reduction ironmaking method, in particular to a tube furnace-shaft furnace double coal-based smelting reduction ironmaking method. Background technique [0002] At present, the more popular two-step coal-based smelting reduction ironmaking methods mainly include: suspension furnace-electric furnace duplex method, rotary kiln-electric furnace duplex method, fluidized bed-shaft furnace duplex method. [0003] Suspension furnace - electric furnace duplex method. First, the iron ore powder and fine-grained carbon powder are blown into the suspension furnace by air, the iron ore powder and carbon powder are suspended in the air, the coal burns to release heat, and 70% of the oxygen in the iron ore powder is taken away for pre-reduction Fine iron particles are produced, and the materials that fall to the bottom of the furnace by gravity are melted and finally reduced by the electric furnace. And realize slag-i...
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